There are multiple types of foam, but they all have a similar weakness with a similar solution. I was able to pick up 3 different colors, chocolate brown (satan) for the fascia, tan (flat) for the pink foam and light blue (flat) for backdrops, all for $9 each. Put your gesso or latex paint into a paint tray. Typical waterborne paints are acrylic or vinyl lattices used for painting building interiors and exteriors or water-soluble industrial paints. Is it advisable to coat it with a latex paint or housewrap? 1. I put on a house addition with XPS on the exterior. Now , that said I get my products at Hobby Lobby cause it's closest and the products they sell can be used on model railroads. Then the paint roller should be coated evenly with the paint. I haven't tried glassing over painted XPS or EPS foam. Basically I got 3 for the price of 1, all premium paint. Any easier ways? I have heard that acrylic paint can seal it, but I just wanna double check. The foam needs to be sealed so it can withstand a … He mentions that one of his least favorite things to do is draw brick lines. I won't be able to side it until next year, leaving the foam exposed to sun and elements. Spray coating / painting XPS foam. OC Help. The sanding of the foam insulation is only essential when doing craft work or decors. XPS can be a very useful material - it shouldnt be given such dismissal so easily as the forum members here like to do. Step 2 - Choose Supplies and Prep. Hi : Being new doesn't mean I can't be helpful . I need to know of an easy way to seal polystyrene, or insulation foam. Watched your shaping video, and I have a couple of comments. I know urethane resin works, but I don't have any on hand. This is my first project using these materials so I have a lot to learn. You can paint polystyrene foam or expanded polystyrene beads using a waterborne paint to protect it from solvent attack by subsequent coats of paint. I have used paint that is for plastics (rattle can from hardware store) and it didn't melt the foam, but I only used it to get my outline. Yes its a weak foam compared to your structural foam cores for hulls and things but you can find many uses for it in other places on boats besides a hull. Go to Home Depot (any bix box store) and check the paint department for discards or returns. I generally use an acrylic spray paint made to use on foam products .if you are looking to base coaat for setup and beginning your scenics Use this . The gesso acts as the primer. Hoping to hear from those with experience carving XPS foam forms/dioramas intended to withstand the elements, or even better, forms/dioramas specifically designed to support a working water feature. Painting XPS rigid foam board (Kingspan GreenGuard) [there doesn’t appear to be a way to post j text in this forum but basically I j want to know how I can paint XPS] Close. 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